add remove file process (#134)

cmd/rm.go

@@ -5,6 +5,7 @@ package cmd
 
 import (
 	"fmt"
+	"os"
 	"path/filepath"
 	"strings"
 
@@ -37,6 +38,24 @@ var rmCmd = &cobra.Command{
 			}
 		}
 
+		// remove file from working tree and index
+		for _, arg := range args {
+			cleanedArg := filepath.Clean(arg)
+			cleanedArg = strings.ReplaceAll(cleanedArg, `\`, "/")
+
+			// remove from the working tree
+			if _, err := os.Stat(cleanedArg); !os.IsNotExist(err) {
+				if err := os.Remove(cleanedArg); err != nil {
+					return fmt.Errorf("fail to delete %s from the working tree: %w", cleanedArg, err)
+				}
+			}
+
+			// remove from the index
+			if err := client.Idx.DeleteEntry(client.RootGoitPath, []byte(cleanedArg)); err != nil {
+				return fmt.Errorf("fail to delete '%s' from the index: %w", cleanedArg, err)
+			}
+		}
+
 		return nil
 	},
 }